ASP.NET Color Picker - Callback with MS ASP.NET AJAX

<asp:HiddenFieldrunat="server"id="HiddenValue"value=""/><asp:UpdatePanelID="UpdatePanel1"runat="server"><ContentTemplate> Click to the box:<obout:ColorPickerrunat="server"OnClientOpen="OnColorOpen"OnClientPicked="OnColorPicked"TargetId="color"TargetProperty="style.backgroundColor"><asp:TextBoxreadOnly="true"id="color"style="cursor: pointer;"runat="server"/></obout:ColorPicker><asp:Buttonrunat="server"Text="Submit"/><br/><br/><asp:labelid="Message"runat="server"Text="&nbsp;"/></ContentTemplate></asp:UpdatePanel>